Real-time IGW-NET Help

Domain Draw Help

  A. DomainRect
  B. DomainPoly
  C. DM from a .txt file
  D. DM from a shapefile
  E. DM from DataNet
  F. Watershed from DataCenter
  G. SWAT Delineated Watershed
  H. Paste
  I. Save DM as a txt file

A. DomainRect

This option allows the user to create a rectangular-shaped modeling domain within the Map Display Work Area (MDWA). Once selected, indicate the position of the first vertex with a single LM click, and indicate the position of the vertex diagonal from the initial vertex with another single LM click. Click 'SaveShape' to finalize/close the domain rectangle.

B. DomainPoly

This option allows the user to trace out a polygon of any shape as the model domain. Once selected, single-click the LM button to define the vertices of the polygon that will define the model domain. Click 'SaveShape' to finalize/close the domain polygon.

C. DM from a .txt file

This option enables uploading a .txt file with the coordinates of polygon to serve as the model domain. This can be used for a REAL-WORLD study area or a SYNTHETIC study area.

Real-world study area

The following describes the file format (line-by-line text inputs) for a REAL-WORLD study area. Each step represents the expected input (left) and an example of text input.

Projection System file contents and Feature name(s)

PCS:GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433],AUTHORITY["EPSG",4326]]Names:DomainPoly

Enter 'PCS:', then copy and paste the contents of the prj. file associated with the feature;
then enter 'ORG:' followed by the x- and y-coordinates of the (lower-leftmost vertex), seperated with ',';
then enter 'Names:' followed by the name/ID of the zone feature.

Units:

Lat-Lon

Enter 'Lat-Lon' for coordinates entered in latitude-longitude format, or enter 'Meters' or 'Feet' if the coordinates are measured distances relative to the projection system origin.

Number of features contained in the file

Typically, this is '1'. Note that, if more than one zone feature is added, the first zone will be used as the domain polygon.

Number of vertices in each feature

Seperate the input with each value with ','.

Coordinate for 1st vertex, for 1st feature	-86.2511496656153,42.7298366626573
Coordinate for 2nd vertex, 1st feature	-86.2507908470808,42.6287558023075

Starting with line 5, all remaining lines represent a single vertex coordinate. The coordinates for a single feature are "grouped together" (one row after another) until the coordinates for all of the vertices have been entered.

DM .txt file for Synthetic study area

Before attempting to load a .txt file for a synthetic model domain, first select 'Go to Synthetic Case Area' (This creates a synthetic model domain of default size). Then choose DM from a txt File from the DrawDomain sub-menu.

The file format for a SYNTHETIC study area is largely the same as for a REAL WORLD study area, except that the entires for 'PCS:' and 'ORG:' should be "null". For example:

PCS:nullORG:nullNAMES:domainpolygon
Meter
1
4
0,0
0,750
1000,750
1000,0

Note that, for SYNTHETIC cases, the coordinates are relative to a x0,y0 which has been fixed (hence, ORG:null).

D. DM from a shapefile

This option allows importing geospatial vector data stored as a shapefile as a polygon representing the model domain. Attributes of any imported model domain are assigned using the DomainAttr button.

E. DM from DataNet

This button initiates the process to transfer a polygon (WFS) feature from M4W DataNET into the IGW-NET environment as a the IGW-NET model domain.

If a linked DataNET page is not already opened, clicking this button the first time will open a new DataNET page inside the browser. Login using your MAGNET account, select the layer of interest from the Data TreeView, draw a selection box inside the specific polygon feature of interest, and use Data Transfer to send the polygon into IGW-NET (Data Manipulation > Transfer > select WFS Service > Send).

If the selection box overlaps two or more polygon features, all of the features will be transferred into IGW-NET and available for import; the user decides which one to use as the model domain during import).

F. Watershed from DataCenter

This tool allows the user to import a watershed boundary from the MAGNET Data Center as the IGW-NET model domain. Different levels (sizes) of watersheds are available in the United States and globally.

G. SWAT Delineated Watershed

This option allows users to import a watershed delineated in M4W SwaNET using the TauDEM (Terrain Analysis Using D igital Elevation M dels) approach for extraction.

Using this option will import the latest watershed (model boundary) delineated in SwaNET using the same MAGNET user account that is being used in IGW-NET.

H. Paste

Select this option to paste the last copied zone (polygon) feature as the current model domain. Access a zone's attribute window with the ZoneAttr option to copy a zone feature.

I. Save DM as a txt file

This exports the DM as a text (.txt) file that can be directly loaded back into IGW-NET at a later time (see 'DM from a .txt File' above) - by the same user, or a different user.